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Pension and Other Postretirement Employee Benefit Plans
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Employee Benefit Plans
Pension and Other Postretirement Employee Benefit Plans
The following table details the components of net periodic cost of our company-sponsored pension and OPEB plans for the periods presented:
 
Three Months Ended June 30,
(In thousands)
2017
 
2016
 
2017
 
2016
 
Pension Benefit Plans
 
Other Postretirement
Employee  Benefit Plans
Service cost
$
474

 
$
382

 
$
13

 
$
51

Interest cost
3,296

 
3,633

 
667

 
810

Expected return on plan assets
(4,688
)
 
(4,878
)
 
(1
)
 
(1
)
Amortization of prior service cost (credit)
2

 
6

 
(384
)
 
(428
)
Amortization of actuarial loss (gain)
2,412

 
2,761

 
(1,821
)
 
(2,058
)
Net periodic cost
$
1,496

 
$
1,904

 
$
(1,526
)
 
$
(1,626
)
 
Six months ended June 30,
(In thousands)
2017
 
2016
 
2017
 
2016
 
Pension Benefit Plans
 
Other Postretirement
Employee  Benefit Plans
Service cost
$
1,034

 
$
780

 
$
81

 
$
125

Interest cost
6,574

 
7,261

 
1,371

 
1,576

Expected return on plan assets
(9,382
)
 
(9,761
)
 
(1
)
 
(1
)
Amortization of prior service cost (credit)
4

 
11

 
(767
)
 
(856
)
Amortization of actuarial loss (gain)
4,937

 
5,645

 
(3,301
)
 
(3,441
)
Net periodic cost
$
3,167

 
$
3,936

 
$
(2,617
)
 
$
(2,597
)

During the six months ended June 30, 2017 and 2016, we made no contributions to our qualified pension plans. We do not expect, nor are we required, to make contributions in 2017.
During the six months ended June 30, 2017, we made contributions of $0.2 million to our company-sponsored non-qualified pension plan. We estimate contributions will total $0.4 million in 2017. We do not anticipate funding our OPEB plans in 2017 except to pay benefit costs as incurred during the year by plan participants.
During the three and six months ended June 30, 2017, less than $0.1 million and $0.3 million, respectively, of net periodic pension and OPEB costs were charged to "Cost of sales" and less than $0.1 million and $0.2 million, respectively, were charged to "Selling, general and administrative expenses" in the accompanying Consolidated Statements of Operations. During the three and six months ended June 30, 2016, $0.1 million and $0.8 million, respectively, of net periodic pension and OPEB costs were charged to "Cost of sales" and $0.1 million and $0.5 million, respectively, were charged to "Selling, general and administrative expenses" in the accompanying Consolidated Statements of Operations.